CHDIR: Difference between revisions
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{{PageExamples}} | {{PageExamples}} | ||
''Example 1:'' The following code is Windows-specific: | ''Example 1:'' The following code is Windows-specific: | ||
{{CodeStart}} | {{CodeStart}} | ||
{{Cl|CHDIR}} "C:\" 'change to the root drive C (absolute path) | {{Cl|CHDIR}} "C:\" 'change to the root drive C (absolute path) | ||
{{Cl|CHDIR}} "DOCUME~1" 'change to "C:\Documents and Settings" from root drive (relative path) | {{Cl|CHDIR}} "DOCUME~1" 'change to "C:\Documents and Settings" from root drive (relative path) | ||
{{Cl|CHDIR}} "..\" 'change back to previous folder one up | {{Cl|CHDIR}} "..\" 'change back to previous folder one up | ||
{{CodeEnd}} | {{CodeEnd}} | ||
:''Details:'' '''QB64''' can use long or short (8.3 notation) file and path names. | :''Details:'' '''QB64''' can use long or short (8.3 notation) file and path names. | ||
| Line 24: | Line 24: | ||
''Example 2:'' Using the Windows API to find the current program's name and root path. The PATH$ is a shared function value. | ''Example 2:'' Using the Windows API to find the current program's name and root path. The PATH$ is a shared function value. | ||
{{CodeStart}} | {{CodeStart}} | ||
{{Cl|_TITLE}} "My program" | {{Cl|_TITLE}} "My program" | ||
{{Cl|PRINT}} TITLE$ | {{Cl|PRINT}} TITLE$ | ||
| Line 45: | Line 45: | ||
start = posit + 1 | start = posit + 1 | ||
{{Cl|LOOP}} {{Cl|UNTIL}} posit = 0 | {{Cl|LOOP}} {{Cl|UNTIL}} posit = 0 | ||
TITLE$ = {{Cl|MID$}}(PATH$, last + 1) | TITLE$ = {{Cl|MID$ (function)|MID$}}(PATH$, last + 1) | ||
PATH$ = {{Cl|LEFT$}}(PATH$, last) | PATH$ = {{Cl|LEFT$}}(PATH$, last) | ||
{{Cl|ELSE}} TITLE$ = "": PATH$ = "" | {{Cl|ELSE}} TITLE$ = "": PATH$ = "" | ||
{{Cl|END IF}} | {{Cl|END IF}} | ||
{{Cl|END FUNCTION}} | {{Cl|END FUNCTION}} | ||
{{CodeEnd}} | {{CodeEnd}} | ||
: '''Note:''' The program's [[_TITLE]] name may be different from the actual program module's file name returned by Windows. | : '''Note:''' The program's [[_TITLE]] name may be different from the actual program module's file name returned by Windows. | ||
Latest revision as of 00:30, 26 February 2023
The CHDIR statement changes the program's location from one working directory to another by specifying a literal or variable STRING path.
Syntax
- CHDIR path$
Description
- path$ is the new directory path the program will work in.
- path$ can be an absolute path (starting from the root folder) or relative path (starting from the current program location).
- If path$ specifies a non-existing path, a "Path not found" error will occur.
- A QB64 SHELL statement cannot use "CD " or "CHDIR " + path$ to change directories.
Examples
Example 1: The following code is Windows-specific:
CHDIR "C:\" 'change to the root drive C (absolute path) CHDIR "DOCUME~1" 'change to "C:\Documents and Settings" from root drive (relative path) CHDIR "..\" 'change back to previous folder one up |
- Details: QB64 can use long or short (8.3 notation) file and path names.
Example 2: Using the Windows API to find the current program's name and root path. The PATH$ is a shared function value.
_TITLE "My program" PRINT TITLE$ PRINT PATH$ FUNCTION TITLE$ === SHOW CURRENT PROGRAM SHARED PATH$ 'optional path information shared with main module only DECLARE LIBRARY 'Directory Information using KERNEL32 provided by Dav FUNCTION GetModuleFileNameA (BYVAL Module AS LONG, FileName AS STRING, BYVAL nSize AS LONG) END DECLARE FileName$ = SPACE$(256) Result = GetModuleFileNameA(0, FileName$, LEN(FileName$)) '0 designates the current program IF Result THEN 'Result returns the length or bytes of the string information PATH$ = LEFT$(FileName$, Result) start = 1 DO posit = INSTR(start, PATH$, "\") IF posit THEN last = posit start = posit + 1 LOOP UNTIL posit = 0 TITLE$ = MID$(PATH$, last + 1) PATH$ = LEFT$(PATH$, last) ELSE TITLE$ = "": PATH$ = "" END IF END FUNCTION |
- Note: The program's _TITLE name may be different from the actual program module's file name returned by Windows.
See also